Incandescent lamp or burner



(No Model.)

D. J. PRENDERGAST. INGANDESGBNT LAMP 0R BURNER.

Patented Jan. 18,1898.

Inventor.

s e S s e m W Attorney.

In: uonms Firms co. Pwolomwa.. vusmunrcu. n, cv

4o able about the burner-tube.

5o admixture of air and gas.

UNITED STATES PATENT EricE.

DANIEL J. PRENDERGAST, OF NEVT YORK, N. Y., ASSIGNOR TO TIIE PENN- SYLVANIA GLOBE GAS LIGHT COMPANY, OE PENNSYLVANIA.

INCANDESCENT LAMP OR BURNER.

SPECIFICATIONforming part of Letters Patent No. 597,430, dated January 18, 1898.

Application filed November 10, 1896A. Serial No. 611,581. (No model.)

5 provement in Incandescent Lamps or Burners, of which the following is a specification.

My invention has reference to incandescent lamps or burners, and it consists of certain improvements which are fully set forth in to the following specification and shown in the accompanying drawings, which form a part j thereof.

The object of my invention is to provide a construction of gas-burner adapted for rendering a mantle of refractory material incandescent, more especially for outside and street lighting. I have found the best results to be secured by providing a maximum air-supply and regulating the gas-supply to suit the preseo sure in the mains by use of an auxiliary needle-valve in addition to the main valve. In those cases where two burners are arranged upon the same gas-main-such, for example, as set out in application Serial No. 608,922,

filed October 15, 1896-the use of these auX- iliary valves has special merit, since it becomes possible to secure the proper supply of gas to each burner irrespective of any clogging of the pipes leading to either of the 3o burners.

In carrying out my invention I provide the burner with a needle-valve carried by the gaspipe and vertically adjustable therein and adapted to operate in connection with a valveseat detachably secured upon the upper end of the gas-pipe. I arrange a Bunsen burner-` tube over and secured to the valve-seat and formed with lateral air-openings at its base controlled by a cylindrical air-valve' adjust- The burner proper is provided with a downwardly-extending tubular sleeve adapted to fit over the burner-tube and be supported thereby. More particularly the valve-seat of the needle-valve is formed with an upwardly-extending conical seat portion having a gas-orifice in the apenthereof, and the air-openings in the burner-tube are preferably extended below the conical valve-seat, so as to create a better The above construction enables the needle-valve to be readily removed for cleaning Without dismantling the incandescent burner proper, a feature highly desirable in street-lighting lamps. It furthermore permits, in a fully organized lamp, a quick and accurate adjustment ofthe flow of gas to obtain the highest brilliancy from the iucandescing mantle.

Another portion of my invention has reference to the construction of the support for the mantle, whereby it may be arranged within the mantle and central upon the top of the burner. The strain upon this support is centrally disposed7 thus insuring less jar and vibration to the mantle, and being Within the' mantle it does not obstruct the light or come into con tact with the mantle in case it curves ounvarcl under the action of the heat and draft, as so frequently happens in practice. The specific improvements relating to this part of my invention are fully referred to hereinafter and include, in connection with the construction of the support proper, the provision of the mantle with a non-combustible transverse wire support 4adapted to sustain it when in use and a combustible adjusting-loop or suspending-piece for adjusting it in position when setting up the lamp. v

Another feature of novelty of my improved burner is in the support for the gauze screen or insect-guard, whereby it is carried by and moves with the air-valve and forms an immon diate means for adjusting the air-valve.

My invention will'be better understood by reference to the accompanying drawings, in which- Figure l is a sectional elevation of an incandescent burner embodying my improvements. Fig.2 is a sectional plan view of same on line y y. Fig. 3 is a sectional plan view of saine on line o: az, and Fig. 4- is an elevation of the branching pipes for a d uplen or double burner.

A is an angular gas-supply pipe leading from the top of the gas-main of any streetlamp post or other fixture, and has screwed onto its upper end B a valve-seat C, formed somewhat conical and terminating in a central opening D.

E is a needle-valve screwed into the top B ICO of the angular gastube A and having the needle-point e working through the central aperture D of seat C. The milled head or thumb-piece of the needle -valve operates freely in the space below the upper offset or angular part of the gas-pipe and is so formed as to permit the same to be whollywithdrawn, if desired, for cleaning without removing the incandescent burner proper. Screwed upon the top of the angular gas-pipe or its valveseat C is the Bunsenkburner-tube G, which has at its bottom F the air-apertures f, which, as shown, are somewhat below the nozzle D, so as to increase the suction tendency of the gas upon the air. Surrounding Vthe lower or enlarged part F of the tube G is the air-valve H, consisting of a cylindrical case having apertures 7i, corresponding to the apertures f, and also having its top and bottom llanged, as atl-I. 'A screen or gauze cylinderI is slipped over the iianges, and its top is bent inward, so as to sustain the weight. A an ged annular ring i is placed over the upper edge of the ganze and iiange H to hold the two irmly together and provide a solid means for adjusting the air-valve. It will be seen that in this manner the screen or gauze moves with the air-valve andis directly supported by it. This screen is to keep bugs and insects generally out of the burner, they being a source of great trouble in outdoor lighting.

The burnerhead proper, J, is provided with a downwardly-extending tubular part J', iitting loosely over the tube G and by which it is sustained. The head is provided with a wire-gauze screen K, held down by a flanged annular ring L. The central part of the screen K is provided with a socket lli, formed of a tube-spine, so as to have a closed bottom, open top, and a shoulder intermediate. Over this socket and resting upon the shoulder is a rounded button N, and upon the opposite side of the screen is a nut O, screwed down upon the socket, so as to clamp it and the button firmly to the screen. spreads the gas and causes the flame to be produced like a cylinder. Supported in the socket M is a central wire P, having its upper end flattened and notched, as at p.

Q is the mantle, of refractory material, and at its top it is contracted and formed with a transverse wire q, which rests in the notch jp. This wire may have a thread R for handling the mantle when adjusting it into position, and this will be consumed when the burner is lighted. By this construction the mantle is centrally supported and subjected to uniform strains. It is devoid of the objections to the outside wire support-namely, the interception of the light, liability of touching and destroying the heated mantle, and the liability to injury to the mantle from jarring due to unevenly-distributed weight. It is evident that the socket may be arranged in This` construction any other suitable manner, if desired, that illustrated 'being a simple and practical construction excellently adapted tothe purpose.

S is the glass chimney, and is supported upon a suitable frame S in the usual way. I is the conical shield, arranged about the burner yand having for its object the protection of the lower part of the mantle and also to cause the upward draft of air to be directed toward the mantle and gas-burner.

In Fig. 4. I have two branching burner gaspipes from the single main pipe. In this case the angular pipes A A unite in a T, which connects with the main gas-pipe U. Thevertical part is provided with a valve A for controlling the supply of gas to both burners, and each angular gas-pipe is provided with the needle-valve E for independently regulating the gas-to the burners. Without these independent needle-valves it would be impossible to secure the best results from the burners. The burnersproper are shown in Fig. l.

While I prefer the construction shown, I do not limit myself to the details thereof, as they may be modifiedin various ways without departing from the principles of my invention.

What I claim as new, and desire to secure by Letters "Patent, is-

1. In an incandescent lamp, the combination'of a gas-pipe having an opening at the top, a needle-valve rcarried by said pipe and verticallyadj ustable therein, a valve-seat detachably screwed upon the upper .end of the gas-pipe and receiving the needle -valve, a Bunsen burner-tube secured tothe valve-seat and formed with lateral air-openings at its base and a shoulder above them, a cylindrical air-valve adj ustablysurrounding the burnertube and havingair-apertures corresponding to those of the tube, and a burner proper having a downwardly-extendingA tubular sleeve adapted to fit over the burner-tube and rest upon the shoulder.

2. In an incandescent burner, the combina* tion of the burner-screen K, a tubular socket M arranged centrally through the screen, button N having a spherical under surface upon the under side ofthe screen and surrounding the socket and held thereby, nut O for holding the socket and button to the screen, an upright central supporting-wire P, and a mantle Q sustained by the wire P and encircling it.

3. In an incandescent burner, the combination of a central supporting-wire extending upwardvfrom the center of the burner, an encircling mantle surrounding the burner and support and having a transverse wire to hang upon the top of the support, anda loop or adj usting-piece formed of combustible material attached to the mantle at the top whereby after adjustment the loop or adjusting-piece will be consumed.

4. An incandescing mantle having at its top a transverse non-combustible wire to support IIO it when in use, and a. combustible' suiljusifinbloop or suspending-piece which shall become burned up upon heating the manine in use.

5. In an incandescent burner, the Bunsen tube having air-apertures on the sides and a. gas-aperture on 'che bottom, in combination with an air-valve formed of a. cylinder sur- 1'ounding the Bumsen tube having ab both the top and bottoni an annular ange o1' rim by which to adjust it, and a, cylindrical screen 1o extending between the two flanges o1' rims and supported thereby.

In testimony of which invention I have hereunto set my hand.

n DANIEL J. PRENDERGAST. Vitnesses:

SAML. H. HORN, J. F. CASSIDY. 

